projs/20161008_web_page_thumbnail_make/indexfile_make.php

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//indexfile_make.php, v0.1a, Copyright David T. Ashley, 2016
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//Copyright 2016 David T. Ashley
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//This source code and any program in which it is compiled/used is provided under the GNU GENERAL
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//IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
//ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//  16. Limitation of Liability.
//
//  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
//WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
//THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
//GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
//USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
//DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
//PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
//EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGES.
//
//  17. Interpretation of Sections 15 and 16.
//
//  If the disclaimer of warranty and limitation of liability provided
//above cannot be given local legal effect according to their terms,
//reviewing courts shall apply local law that most closely approximates
//an absolute waiver of all civil liability in connection with the
//Program, unless a warranty or assumption of liability accompanies a
//copy of the Program in return for a fee.
//
//                     END OF TERMS AND CONDITIONS
//
//            How to Apply These Terms to Your New Programs
//
//  If you develop a new program, and you want it to be of the greatest
//possible use to the public, the best way to achieve this is to make it
//free software which everyone can redistribute and change under these terms.
//
//  To do so, attach the following notices to the program.  It is safest
//to attach them to the start of each source file to most effectively
//state the exclusion of warranty; and each file should have at least
//the "copyright" line and a pointer to where the full notice is found.
//
//    <one line to give the program's name and a brief idea of what it does.>
//    Copyright (C) <year>  <name of author>
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//Also add information on how to contact you by electronic and paper mail.
//
//  If the program does terminal interaction, make it output a short
//notice like this when it starts in an interactive mode:
//
//    <program>  Copyright (C) <year>  <name of author>
//    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
//    This is free software, and you are welcome to redistribute it
//    under certain conditions; type `show c' for details.
//
//The hypothetical commands `show w' and `show c' should show the appropriate
//parts of the General Public License.  Of course, your program's commands
//might be different; for a GUI interface, you would use an "about box".
//
//  You should also get your employer (if you work as a programmer) or school,
//if any, to sign a "copyright disclaimer" for the program, if necessary.
//For more information on this, and how to apply and follow the GNU GPL, see
//<http://www.gnu.org/licenses/>.
//
//  The GNU General Public License does not permit incorporating your program
//into proprietary programs.  If your program is a subroutine library, you
//may consider it more useful to permit linking proprietary applications with
//the library.  If this is what you want to do, use the GNU Lesser General
//Public License instead of this License.  But first, please read
//<http://www.gnu.org/philosophy/why-not-lgpl.html>.
//-------------------------------------------------------------------------------------------------
//This program, a PHP script, creates thumbnail images for recognized
//image files in the current working directory.  This program is part of a
//3-program suite designed to collectively create a web page directly from
//digital camera files (and of course the web page can be customized by
//hand-editing after it is automatically generated).  The supported process for
//creating a web page involves 3 programs (rather than 1) primarily to circumvent
//the involuntary process termination that will occur in some shared environments
//if a process consumes too much CPU time.
//
//The 3 programs in the 3-program suite are:
//
//   filenames_canonize.php:
//      Converts all names of files in a directory to lower-case, and makes
//      substitutions for any unusual characters.
//
//   thumbnails_make.php (this program):
//      Creates thumbnails from recognized image types.  The thumbnails are
//      named relative to the original image file with the suffix "_small".
//      Only 20 files are converted on each invocation of the program, to
//      avoid the involuntary process termination that typically occurs in
//      a shared hosting environment when a process uses too much CPU time.
//      The program should be run repeatedly until it indicates that it has
//      no more thumbnails to create.
//
//      If any full-sized photos are modified, any corresponding thumbnails
//      should be deleted and thumbnails_make.php and indexfile_make.php should
//      be run again.
//
//   indexfile_make.php
//      Scans a directory and makes an index file ("index2.php") displaying
//      all the thumbnail images, each of which link to the corresponding
//      full-sized image.  The index file is tailored to Dave Ashley's
//      needs, but the created file can be edited and most of the content
//      pasted into an HTML file.  To avoid the accidental loss of 
//      information, any existing "index2.php" file is renamed out of the
//      way.
//
//This script is designed to be run manually (rather than automatically invoked
//as a result of a web page request).  It was written in PHP for convenience
//simply because DreamHost (the web hosting company Dave Ashley uses) has as part
//of its hosting environment PHP with the ImageMagick library compiled in.
//
//Usually, this script is invoked using "php <path>/indexfile_make.php", but the
//method of invocation may vary based on computing platform details.
//--------------------------------------------------------------------------------
//This program is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//The GNU General Public License is reproduced below, and also is 
//available at http://www.gnu.org/licenses/.
//--------------------------------------------------------------------------------
//                    GNU GENERAL PUBLIC LICENSE
//                       Version 3, 29 June 2007
//
// Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
// Everyone is permitted to copy and distribute verbatim copies
// of this license document, but changing it is not allowed.
//
//                            Preamble
//
//   The GNU General Public License is a free, copyleft license for
// software and other kinds of works.
//
//   The licenses for most software and other practical works are designed
// to take away your freedom to share and change the works.  By contrast,
// the GNU General Public License is intended to guarantee your freedom to
// share and change all versions of a program--to make sure it remains free
// software for all its users.  We, the Free Software Foundation, use the
// GNU General Public License for most of our software; it applies also to
// any other work released this way by its authors.  You can apply it to
// your programs, too.
//
//   When we speak of free software, we are referring to freedom, not
// price.  Our General Public Licenses are designed to make sure that you
// have the freedom to distribute copies of free software (and charge for
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//
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// you modify it: responsibilities to respect the freedom of others.
//
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// freedoms that you received.  You must make sure that they, too, receive
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//
//   Developers that use the GNU GPL protect your rights with two steps:
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// giving you legal permission to copy, distribute and/or modify it.
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// authors' sake, the GPL requires that modified versions be marked as
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//   Finally, every program is threatened constantly by software patents.
// States should not allow patents to restrict development and use of
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//
//   The precise terms and conditions for copying, distribution and
// modification follow.
//
//                       TERMS AND CONDITIONS
//
//   0. Definitions.
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//   "This License" refers to version 3 of the GNU General Public License.
//
//   "Copyright" also means copyright-like laws that apply to other kinds of
// works, such as semiconductor masks.
//
//   "The Program" refers to any copyrightable work licensed under this
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//   To "modify" a work means to copy from or adapt all or part of the work
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// exact copy.  The resulting work is called a "modified version" of the
// earlier work or a work "based on" the earlier work.
//
//   A "covered work" means either the unmodified Program or a work based
// on the Program.
//
//   To "propagate" a work means to do anything with it that, without
// permission, would make you directly or secondarily liable for
// infringement under applicable copyright law, except executing it on a
// computer or modifying a private copy.  Propagation includes copying,
// distribution (with or without modification), making available to the
// public, and in some countries other activities as well.
//
//   To "convey" a work means any kind of propagation that enables other
// parties to make or receive copies.  Mere interaction with a user through
// a computer network, with no transfer of a copy, is not conveying.
//
//   An interactive user interface displays "Appropriate Legal Notices"
// to the extent that it includes a convenient and prominently visible
// feature that (1) displays an appropriate copyright notice, and (2)
// tells the user that there is no warranty for the work (except to the
// extent that warranties are provided), that licensees may convey the
// work under this License, and how to view a copy of this License.  If
// the interface presents a list of user commands or options, such as a
// menu, a prominent item in the list meets this criterion.
//
//   1. Source Code.
//
//   The "source code" for a work means the preferred form of the work
// for making modifications to it.  "Object code" means any non-source
// form of a work.
//
//   A "Standard Interface" means an interface that either is an official
// standard defined by a recognized standards body, or, in the case of
// interfaces specified for a particular programming language, one that
// is widely used among developers working in that language.
//
//   The "System Libraries" of an executable work include anything, other
// than the work as a whole, that (a) is included in the normal form of
// packaging a Major Component, but which is not part of that Major
// Component, and (b) serves only to enable use of the work with that
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// implementation is available to the public in source code form.  A
// "Major Component", in this context, means a major essential component
// (kernel, window system, and so on) of the specific operating system
// (if any) on which the executable work runs, or a compiler used to
// produce the work, or an object code interpreter used to run it.
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//   The "Corresponding Source" for a work in object code form means all
// the source code needed to generate, install, and (for an executable
// work) run the object code and to modify the work, including scripts to
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//   The Corresponding Source need not include anything that users
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// Source.
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//   The Corresponding Source for a work in source code form is that
// same work.
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//   2. Basic Permissions.
//
//   All rights granted under this License are granted for the term of
// copyright on the Program, and are irrevocable provided the stated
// conditions are met.  This License explicitly affirms your unlimited
// permission to run the unmodified Program.  The output from running a
// covered work is covered by this License only if the output, given its
// content, constitutes a covered work.  This License acknowledges your
// rights of fair use or other equivalent, as provided by copyright law.
//
//   You may make, run and propagate covered works that you do not
// convey, without conditions so long as your license otherwise remains
// in force.  You may convey covered works to others for the sole purpose
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// with facilities for running those works, provided that you comply with
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// for you must do so exclusively on your behalf, under your direction
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//   No covered work shall be deemed part of an effective technological
// measure under any applicable law fulfilling obligations under article
// 11 of the WIPO copyright treaty adopted on 20 December 1996, or
// similar laws prohibiting or restricting circumvention of such
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//   When you convey a covered work, you waive any legal power to forbid
// circumvention of technological measures to the extent such circumvention
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// the covered work, and you disclaim any intention to limit operation or
// modification of the work as a means of enforcing, against the work's
// users, your or third parties' legal rights to forbid circumvention of
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//   4. Conveying Verbatim Copies.
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//   You may convey verbatim copies of the Program's source code as you
// receive it, in any medium, provided that you conspicuously and
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//     "keep intact all notices".
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//   "Additional permissions" are terms that supplement the terms of this
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// (including a cross-claim or counterclaim in a lawsuit) alleging that
// any patent claim is infringed by making, using, selling, offering for
// sale, or importing the Program or any portion of it.
//
//   11. Patents.
//
//   A "contributor" is a copyright holder who authorizes use under this
// License of the Program or a work on which the Program is based.  The
// work thus licensed is called the contributor's "contributor version".
//
//   A contributor's "essential patent claims" are all patent claims
// owned or controlled by the contributor, whether already acquired or
// hereafter acquired, that would be infringed by some manner, permitted
// by this License, of making, using, or selling its contributor version,
// but do not include claims that would be infringed only as a
// consequence of further modification of the contributor version.  For
// purposes of this definition, "control" includes the right to grant
// patent sublicenses in a manner consistent with the requirements of
// this License.
//
//   Each contributor grants you a non-exclusive, worldwide, royalty-free
// patent license under the contributor's essential patent claims, to
// make, use, sell, offer for sale, import and otherwise run, modify and
// propagate the contents of its contributor version.
//
//   In the following three paragraphs, a "patent license" is any express
// agreement or commitment, however denominated, not to enforce a patent
// (such as an express permission to practice a patent or covenant not to
// sue for patent infringement).  To "grant" such a patent license to a
// party means to make such an agreement or commitment not to enforce a
// patent against the party.
//
//   If you convey a covered work, knowingly relying on a patent license,
// and the Corresponding Source of the work is not available for anyone
// to copy, free of charge and under the terms of this License, through a
// publicly available network server or other readily accessible means,
// then you must either (1) cause the Corresponding Source to be so
// available, or (2) arrange to deprive yourself of the benefit of the
// patent license for this particular work, or (3) arrange, in a manner
// consistent with the requirements of this License, to extend the patent
// license to downstream recipients.  "Knowingly relying" means you have
// actual knowledge that, but for the patent license, your conveying the
// covered work in a country, or your recipient's use of the covered work
// in a country, would infringe one or more identifiable patents in that
// country that you have reason to believe are valid.
//
//   If, pursuant to or in connection with a single transaction or
// arrangement, you convey, or propagate by procuring conveyance of, a
// covered work, and grant a patent license to some of the parties
// receiving the covered work authorizing them to use, propagate, modify
// or convey a specific copy of the covered work, then the patent license
// you grant is automatically extended to all recipients of the covered
// work and works based on it.
//
//  A patent license is "discriminatory" if it does not include within
// the scope of its coverage, prohibits the exercise of, or is
// conditioned on the non-exercise of one or more of the rights that are
// specifically granted under this License.  You may not convey a covered
// work if you are a party to an arrangement with a third party that is
// in the business of distributing software, under which you make payment
// to the third party based on the extent of your activity of conveying
// the work, and under which the third party grants, to any of the
// parties who would receive the covered work from you, a discriminatory
// patent license (a) in connection with copies of the covered work
// conveyed by you (or copies made from those copies), or (b) primarily
// for and in connection with specific products or compilations that
// contain the covered work, unless you entered into that arrangement,
// or that patent license was granted, prior to 28 March 2007.
//
//   Nothing in this License shall be construed as excluding or limiting
// any implied license or other defenses to infringement that may
// otherwise be available to you under applicable patent law.
//
//   12. No Surrender of Others' Freedom.
//
//   If conditions are imposed on you (whether by court order, agreement or
// otherwise) that contradict the conditions of this License, they do not
// excuse you from the conditions of this License.  If you cannot convey a
// covered work so as to satisfy simultaneously your obligations under this
// License and any other pertinent obligations, then as a consequence you may
// not convey it at all.  For example, if you agree to terms that obligate you
// to collect a royalty for further conveying from those to whom you convey
// the Program, the only way you could satisfy both those terms and this
// License would be to refrain entirely from conveying the Program.
//
//   13. Use with the GNU Affero General Public License.
//
//   Notwithstanding any other provision of this License, you have
// permission to link or combine any covered work with a work licensed
// under version 3 of the GNU Affero General Public License into a single
// combined work, and to convey the resulting work.  The terms of this
// License will continue to apply to the part which is the covered work,
// but the special requirements of the GNU Affero General Public License,
// section 13, concerning interaction through a network will apply to the
// combination as such.
//
//   14. Revised Versions of this License.
//
//   The Free Software Foundation may publish revised and/or new versions of
// the GNU General Public License from time to time.  Such new versions will
// be similar in spirit to the present version, but may differ in detail to
// address new problems or concerns.
//
//   Each version is given a distinguishing version number.  If the
// Program specifies that a certain numbered version of the GNU General
// Public License "or any later version" applies to it, you have the
// option of following the terms and conditions either of that numbered
// version or of any later version published by the Free Software
// Foundation.  If the Program does not specify a version number of the
// GNU General Public License, you may choose any version ever published
// by the Free Software Foundation.
//
//   If the Program specifies that a proxy can decide which future
// versions of the GNU General Public License can be used, that proxy's
// public statement of acceptance of a version permanently authorizes you
// to choose that version for the Program.
//
//   Later license versions may give you additional or different
// permissions.  However, no additional obligations are imposed on any
// author or copyright holder as a result of your choosing to follow a
// later version.
//
//   15. Disclaimer of Warranty.
//
//   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
// APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
// HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
// IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
// ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//   16. Limitation of Liability.
//
//   IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
// WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
// THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
// GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
// USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
// DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
// PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
// EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGES.
//
//   17. Interpretation of Sections 15 and 16.
//
//   If the disclaimer of warranty and limitation of liability provided
// above cannot be given local legal effect according to their terms,
// reviewing courts shall apply local law that most closely approximates
// an absolute waiver of all civil liability in connection with the
// Program, unless a warranty or assumption of liability accompanies a
// copy of the Program in return for a fee.
//--------------------------------------------------------------------------------
//C O N F I G U R A T I O N
//--------------------------------------------------------------------------------
//Configuration switch combinations were not tested.  E-mail me any program
//corrections (dashley@gmail.com).
define ("CFG_PROGNAME", "indexfile_make.php");
   //Program name.
define ("CFG_CONSOLE_STD_LINE_LEN", 78);
   //Number of characters per line preferred for console output.
define ("CFG_THUMBNAIL_FILENAME_SUFFIX", "_small");
   //String added just before the filename extension to choose thumbnail names
   //based on name of full-sized image.
define ("CFG_INDEXFILE_NAME", "index2.php");
   //Name of the file containing the index.  PHP code is assumed, but the
   //file can be harvested for the HTML.
define ("CFG_INDEXFILE_PICREF_INDENT", 3);
   //The number of spaces to indent each reference to a picture.
define ("CFG_FILEEXTENSIONS_PHOTO", "jpg/jpeg");
   //The file extensions that will be recognized as photos.
define ("CFG_FILEEXTENSIONS_LINK", "mov");
   //File extensions that will be linked to.  All others will be mentioned
   //in the generated output but not linked to.
//--------------------------------------------------------------------------------
//Repeats a character to the console output a certain number of times.
function rep_char_con($c, $n)
{
   while ($n--)
      echo $c;
}
//--------------------------------------------------------------------------------
//Writes a standard thick horizontal line to the console.
function hor_line_thick()
{
   rep_char_con("=", CFG_CONSOLE_STD_LINE_LEN);
   echo "\n";
}
//--------------------------------------------------------------------------------
//Writes a standard thin horizontal line to the console.
function hor_line_thin()
{
   rep_char_con("-", CFG_CONSOLE_STD_LINE_LEN);
   echo "\n";
}
//--------------------------------------------------------------------------------
//Returns an array of all files in the working directory.
//If no files can be found, returns FALSE.
function get_file_names_in_dir()
{
   //Get directory list.
   $rv = scandir (".");

   //If the list is empty, something went wrong.  Return FALSE.
   if ($rv === FALSE)
      return FALSE;

   return $rv;
}
//--------------------------------------------------------------------------------
//Accepts a non-negative integer as an integer or a string.  Adds commas in the 
//right places to make it more human readable.
function int_nonneg_commanate($in_ui)
{
   //Ensure the integer is an integer from PHP's point of view.
   $in_ui = (int)$in_ui;

   //If a negative number was passed in, clip it.
   if ($in_ui < 0)
      $in_ui = 0;

   //Make a proper numerical string with commas out of it.
   $s_ui = number_format($in_ui);

   return $s_ui;
}
//--------------------------------------------------------------------------------
//Returns TRUE if a file name appears to be a valid full-sized image name, 
//or FALSE otherwise.
function is_full_sized_image_file_name($in_filename)
{
   //Convert the string name to all lower case.  This will do for
   //comparisons and tests.
   $s = strtolower($s);

   //Attempt to split the name into a base and an extension.  Any failure
   //means it is an unsuitable name.
   $extension_start = strrpos($in_filename, ".");
      //Find position of last "." in string.  This should precede the
      //file extension.

   if ($extension_start === FALSE)
   {
      //Bad name.  Unsuitable.
      return FALSE;
   } 

   //Calculate the base and extension.
   $filename_base    = substr($in_filename, 0, $extension_start);
   $filename_extension = substr($in_filename, $extension_start + 1);

   //If the extension is neither "jpg" nor "jpeg", it is unsuitable.
   if (($filename_extension != "jpg") && ($filename_extension != "jpeg"))
      return FALSE;

   //If the filename base is empty, the filename is unsuitable.
   if (strlen($filename_base) == 0)
      return FALSE;

   //If the last characters of the base are the CFG_THUMBNAIL_FILENAME_SUFFIX,
   //the name is unsuitable.
   if (strlen($filename_base) >= strlen(CFG_THUMBNAIL_FILENAME_SUFFIX))
   {
      if (substr($filename_base, strlen($filename_base) - strlen(CFG_THUMBNAIL_FILENAME_SUFFIX)) 
          == CFG_THUMBNAIL_FILENAME_SUFFIX)
         return FALSE;
   }

   //Looks good.
   return TRUE;
}
//--------------------------------------------------------------------------------
//As a function of the file name, creates the file name for the thumbnail.
function file_name_to_thumbnail_name($in_filename)
{
   $extension_start = strrpos($in_filename, ".");
      //Find position of last "." in string.  This should precede the
      //file extension.
   if ($extension_start === FALSE)
   {
      //"." not found.  Should not happen.  Filenames were checked in advance.
      echo "Fatal internal error at line " . __LINE__ . "\n";
      exit(1);
   } 

   $filename_prefix    = substr($in_filename, 0, $extension_start);
   $filename_extension = substr($in_filename, $extension_start);

   $rv = $filename_prefix . CFG_THUMBNAIL_FILENAME_SUFFIX . $filename_extension;

   return $rv;
}
//--------------------------------------------------------------------------------
//Writes the index file preamble to the index file.  This is very much
//dependent on how the thumbnails will be used.  This is currently customized
//for what Dave Ashley does.
function write_index_file_preamble($handle, $idstring)
{
   fwrite($handle, "<" . "?" . "php\n");
   fwrite($handle, "require_once(\"style/std/stdwpstyle.inc\");\n");
   fwrite($handle, "?" . ">" . "\n");
   fwrite($handle, "<" . "?" . "php\n");
   fwrite($handle, "   $" . "thispage = new StdWpStyle();\n");
   fwrite($handle, "\n");
   fwrite($handle, "   $" . "thispage->static_page_header_title_std(\"" . $idstring . "\",\n");
   fwrite($handle, "                                           \"" . $idstring . "\",\n");
   fwrite($handle, "                                           \"\");\n");
   fwrite($handle, "   $" . "thispage->static_page_photo_thumbnail_explanation(TRUE, TRUE);\n");
   fwrite($handle, "?" . ">" . "\n");
   for ($i = 0; $i < CFG_INDEX_PARAGRAPH_INDENT; $i++)
   {
      fwrite($handle, " ");
   }
   fwrite($handle, "\n<p align=\"center\">\n");
}
//--------------------------------------------------------------------------------
//Writes the index file postamble to the index file.  This is very much
//dependent on how the thumbnails will be used.  This is currently customized
//for what Dave Ashley does.
function write_index_file_postamble($handle)
{
   for ($i = 0; $i < CFG_INDEX_PARAGRAPH_INDENT; $i++)
   {
      fwrite($handle, " ");
   }
   fwrite($handle, "</p>\n\n");
   fwrite($handle, "<" . "?" . "php\n");
   fwrite($handle, "   $" . "thispage->static_page_footer_std();\n");
   fwrite($handle, "?" . ">" . "\n");
}
//--------------------------------------------------------------------------------
//Writes a line to the index file corresponding to a linked larger picture
//reprsented by a thumbnail.
function write_index_line(  $handle,
                            $filename, 
                            $thumbnailname,
                            $filename_filesize,
                            $filename_xdim,
                            $filename_ydim,
                            $thumbnailname_filesize,
                            $thumbnailname_xdim,
                            $thumbnailname_ydim)
{
//<a href="dscn1258.jpg"><img border="0" src="dscn1258_small.jpg" alt="dscn1258.jpg (4932338 bytes)" width="125" height="93"></a>
   //Indent.
   for ($i = 0; $i < CFG_INDEX_LINK_INDENT; $i++)
   {
      fwrite($handle, " ");
   }

   fwrite($handle, "<a href=\"");
   fwrite($handle, $filename);
   fwrite($handle, "\"><img border=\"0\" src=\"");
   fwrite($handle, $thumbnailname);
   fwrite($handle, "\" alt=\"");
   fwrite($handle, $filename);
   fwrite($handle, " (");
   fwrite($handle, int_nonneg_commanate($filename_filesize));
   fwrite($handle, " bytes)\" ");
   fwrite($handle, "title=\"");
   fwrite($handle, $filename);
   fwrite($handle, " (");
   fwrite($handle, int_nonneg_commanate($filename_filesize));
   fwrite($handle, " bytes)\" width=\"");
   fwrite($handle, $thumbnailname_xdim);
   fwrite($handle, "\" height=\"");
   fwrite($handle, $thumbnailname_ydim);
   fwrite($handle, "\"></a>");
   fwrite($handle, "\n");
}
//--------------------------------------------------------------------------------
   //Write introductory message.
   hor_line_thick();
   echo CFG_PROGNAME . " Copyright (C) 2015 David T. Ashley\n";
   echo "This program comes with ABSOLUTELY NO WARRANTY; and is licensed under\n";
   echo "the GNU General Public License, Version 3.  A copy of this license is\n";
   echo "provided in the source code of this program.\n";
   hor_line_thin();
   //-----------------------------------------------------------------------------
   //Get the date, time, and PID strings that will be used for the rest of the
   //script.
   $scr_datestring = date("Ymd_His");
   $scr_pid        = getmypid();
   if ($scr_pid === FALSE)
      $scr_pid = 0;
   //-----------------------------------------------------------------------------
   //If the index file exists, rename it out of the way.  This is to prevent
   //the loss of information.
   if (file_exists(CFG_INDEXFILE_NAME))
   {
      rename(CFG_INDEXFILE_NAME, $scr_datestring . "_" . $scr_pid . ".php");
   }      
   //-----------------------------------------------------------------------------
   //Open the index file and write the preamble.
   $indexfile_handle = fopen(CFG_INDEXFILE_NAME, "w");
   if ($indexfile_handle === FALSE)
   {
      echo "FATAL:  unable to open index file.\n";
      exit(1);
   }
   write_index_file_preamble($indexfile_handle, $scr_datestring . "_" . $scr_pid);
   //-----------------------------------------------------------------------------
   //Get and emit the names of everything in the directory.
   $file_list = get_file_names_in_dir();
   if ($file_list === FALSE)
   {
      echo "List of files from PHP function scandir() is empty.\n";
      echo "Serious internal error, or nothing to do.  Script cannot continue.\n";
      hor_line_thick();
      exit(1);
   }
   else
   {
     echo "Files in working directory (unsorted, unfiltered, " 
          . 
          count($file_list)
          . 
          " files):\n";
     for ($i = 0; $i < count($file_list); $i++)
        echo "   " . sprintf("[%5d]", $i) . " " . $file_list[$i] . "\n";
   }
   hor_line_thin();
   //-----------------------------------------------------------------------------
   //Remove the standard directory entries "." and ".." from the list, and 
   //remove any directories.
   $temp_list = $file_list;
   unset($file_list);
   $n = 0;
   for ($i = 0; $i < count($temp_list); $i++)
   {
      //echo "Checking " . $temp_list[$i] . "\n";

      if (strcmp($temp_list[$i], ".") == 0)
      {
         //. entry, not a file.
      }
      else if (strcmp($temp_list[$i], "..") == 0)
      {
         //.. entry, not a file.
      }
      else if (is_file($temp_list[$i]))
      {
         //This is a regular file.
         $file_list[] = $temp_list[$i];
         $n++;
      }
   }
   
   if ($n == 0)
      $file_list = FALSE;

   unset($n);
   unset($temp_list);
   //-----------------------------------------------------------------------------
   //If there is nothing to do, end the script.
   if ($file_list === FALSE)
   {
      echo "No files to process.\n";
      hor_line_thick();
      exit(0);
   }
   //-----------------------------------------------------------------------------
   //Sort the list.  This is a non-event.  The only rationale for sorting is that
   //it ensures that the same set of files will be processed in the same order,
   //regardless of the order provided by the underlying OS internals.
   sort($file_list);
   //-----------------------------------------------------------------------------
   //Emit the names we now have.
   echo "Files in working directory (directory entries removed, sorted, " 
        . 
        count($file_list)
        . 
        " files):\n";
   for ($i = 0; $i < count($file_list); $i++)
      echo "   " . sprintf("[%5d]", $i) . " " . $file_list[$i] . "\n";
   hor_line_thin();

   //-----------------------------------------------------------------------------
   //For each file in the list, process it.  There are different processing
   //actions for each one.
   for ($i = 0; $i < count($file_list); $i++)
   {
      if (is_full_sized_image_file_name($file_list[$i]))
      {
         $thumbnail_name = file_name_to_thumbnail_name($file_list[$i]);

         $image_data = getimagesize($file_list[$i]);
         $thumbnail_data = getimagesize($thumbnail_name);

         write_index_line(  $indexfile_handle,
                            $file_list[$i], 
                            $thumbnail_name,
                            filesize($file_list[$i]),
                            $image_data[0],
                            $image_data[1],
                            filesize($thumbnail_name),
                            $thumbnail_data[0],
                            $thumbnail_data[1]);

      }
   }

   //-----------------------------------------------------------------------------
   //Complete and close up the index file.
   write_index_file_postamble($indexfile_handle);
   fclose($indexfile_handle);

//   $i         = 0;
//   $completed = 0;
//   while (($completed < CFG_MAX_THUMBNAILS_PER_INVOCATION) && ($i < count($file_list)))
//   {
//      if (is_full_sized_image_file_name($file_list[$i]))
//      {
//         $thumbnail_name = file_name_to_thumbnail_name($file_list[$i]);
//
//         if (file_exists($thumbnail_name))
//         {
//            echo "   " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : skipping because corresponding thumbnail exists.\n";
//            hor_line_thin();
//         }
//         else
//         {
//            echo "   " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : creating thumbnail.\n";
//
//            echo "Creating thumbnail \"" .
//                 $thumbnail_name .
//                 "\" from image \"" .
//                 $file_list[$i] .
//                 "\".\n";
//
//            create_thumbnail($file_list[$i], 
//                             $thumbnail_name,
//                             $filename_filesize,
//                             $filename_xdim,
//                             $filename_ydim,
//                             $thumbnail_filesize,
//                             $thumbnail_xdim,
//                             $thumbnail_ydim);
//
//            echo "Conversion complete.\n";
//            echo "   Full-sized image file size/xdim/ydim = " .
//                 $filename_filesize . "/" . $filename_xdim . "/" . $filename_ydim .
//                 ",\n";
//            echo "   Thumbnail image  filesize/xdim/ydim = " .
//                 $thumbnail_filesize . "/" . $thumbnail_xdim . "/" . $thumbnail_ydim .
//                 ",\n";
//
//            hor_line_thin();
//            $completed++;
//         }
//      }
//      else
//      {
//         //Unsuitable base name.  Can't use it.
//         echo "   " . sprintf("[%5d]", $i) . " " . $file_list[$i] . " : skipping due to unsuitable name.\n";
//         hor_line_thin();
//      }
//
//      $i++;
//   }
//
//   //Emit a message about whether the program should be run again.  I am aware of
//   //the uncovered case--where the last thumbnail was made on the last iteration
//   //of this invocation--but I will leave it uncovered for now.  All that happens
//   //is the user runs the program unnecessarily one more time.
//   if ($completed == 0)
//   {
//      echo "No thumbnails were created--this program is done creating thumbnails.\n";
//      echo "It is not necessary to run this program again.\n";
//      hor_line_thin();
//   }
//   else
//   {
//      echo $completed . " thumbnail(s) were created.  Please run this program repeatedly again\n";
//      echo "until no more thumbnails are created.\n";
//      hor_line_thin();
//   }
//--------------------------------------------------------------------------------
   echo CFG_PROGNAME . " execution ends.\n";
   hor_line_thick();
//--------------------------------------------------------------------------------
//End of File
//--------------------------------------------------------------------------------
?>